In Brief: Dec. 18, 2000

RISKY BUSINESS A study of more than 90,000 American teens did not find the expected correlation between dangerous behavior and such factors as race, family income or family structure. Indeed, the kids most likely to drink, smoke, have sex or contemplate suicide came from all sorts of backgrounds. What they had in common was bad grades and a lot of time spent just hanging out.

THE INFERTILITY LIFESTYLE For as many as 1 out of 3 couples who have trouble becoming pregnant within a year of trying, the problem may not be medical but lifestyle related. For example, a new Australian...

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